Answer
Apr 18, 2023 - 05:19 PM
The normal operating temperature for a 5.7L GM engine that’s been marinized by one of the major OEMs (Mercruiser or Volvo as examples) is typically between 160 and 175 degrees Fahrenheit (71 to 79 degrees Celsius). In general water temp should not go above 170 on EFI engines and not much above 160 on carb engines. Higher temps can cause corrosion to start building up in the exhaust system.
Exact operating temperatures can vary depending on several factors, including the specific engine model, the boat's operating conditions, and the type of cooling system used. It is important to consult the manufacturer's guidelines for the specific engine to determine the recommended operating temperature range. Temperatures from 190F up to the engine’s over temp alarm should make you nervous. The over temp alarm for a 5.7L GM marinized engine typically sounds when the engine's temperature rises above 220-240°F (104-116°C). You should act in accordance with your owners manual if these alarms go off.
Continuing to operate the engine at this temperature can lead to various risks, including engine damage, reduced engine performance, and potential on boat safety hazards due to the engine overheating. If the over temp alarm sounds, it is recommended to evaluate your safety conditions and then shut down the engine posting the appropriate notifications for a stranded boat and then operate in those conditions while you determine whether its logical to investigate the cause of the overheating issue or consider a tow. This is opinion. Always operate in accordance with instructions from the OEM manufacturers.
©2023 Mr. Cool Marine LLC
Exact operating temperatures can vary depending on several factors, including the specific engine model, the boat's operating conditions, and the type of cooling system used. It is important to consult the manufacturer's guidelines for the specific engine to determine the recommended operating temperature range. Temperatures from 190F up to the engine’s over temp alarm should make you nervous. The over temp alarm for a 5.7L GM marinized engine typically sounds when the engine's temperature rises above 220-240°F (104-116°C). You should act in accordance with your owners manual if these alarms go off.
Continuing to operate the engine at this temperature can lead to various risks, including engine damage, reduced engine performance, and potential on boat safety hazards due to the engine overheating. If the over temp alarm sounds, it is recommended to evaluate your safety conditions and then shut down the engine posting the appropriate notifications for a stranded boat and then operate in those conditions while you determine whether its logical to investigate the cause of the overheating issue or consider a tow. This is opinion. Always operate in accordance with instructions from the OEM manufacturers.
©2023 Mr. Cool Marine LLC
